diff --git a/nse_nsock.cc b/nse_nsock.cc
index 2162f221d..372c00c08 100644
--- a/nse_nsock.cc
+++ b/nse_nsock.cc
@@ -425,6 +425,10 @@ static nse_nsock_udata *check_nsock_udata (lua_State *L, int idx, bool open)
       if (nu->source_addr.ss_family != AF_UNSPEC) {
         nsock_iod_set_localaddr(nu->nsiod, &nu->source_addr, nu->source_addrlen);
       } else if (0 == o.SourceSockAddr(&ss, &sslen)) {
+        // Use the exact protocol-specific length.  Some platforms (e.g. FreeBSD)
+        // reject sizeof(sockaddr_storage) passed to bind() with EINVAL.
+        sslen = (ss.ss_family == AF_INET6) ?
+          sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
         nsock_iod_set_localaddr(nu->nsiod, &ss, sslen);
       }
       if (o.ipoptionslen)
@@ -548,6 +552,10 @@ static int connect (lua_State *L, int status, lua_KContext ctx)
   if (nu->source_addr.ss_family != AF_UNSPEC) {
     nsock_iod_set_localaddr(nu->nsiod, &nu->source_addr, nu->source_addrlen);
   } else if (0 == o.SourceSockAddr(&ss, &sslen)) {
+    // Use the exact protocol-specific length.  Some platforms (e.g. FreeBSD)
+    // reject sizeof(sockaddr_storage) passed to bind() with EINVAL.
+    sslen = (ss.ss_family == AF_INET6) ?
+      sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
     nsock_iod_set_localaddr(nu->nsiod, &ss, sslen);
   }
   if (o.ipoptionslen)
diff --git a/scan_engine_connect.cc b/scan_engine_connect.cc
index ace0b6d10..c473166a7 100644
--- a/scan_engine_connect.cc
+++ b/scan_engine_connect.cc
@@ -434,6 +434,10 @@ static void init_socket(int sd, const HostScanStats *hss, UltraScanInfo *USI) {
 #endif
 
   if (!bind_failed && 0 == o.SourceSockAddr(&ss, &sslen)) {
+    // Use the exact protocol-specific length.  Some platforms (e.g. FreeBSD)
+    // reject sizeof(sockaddr_storage) passed to bind() with EINVAL.
+    sslen = (ss.ss_family == AF_INET6) ?
+      sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
     if (::bind(sd, (struct sockaddr*)&ss, sslen) != 0) {
       error("%s: Problem binding source address (%s), errno: %d", __func__, inet_socktop_safe(&ss), socket_errno());
       perror("bind");
diff --git a/service_scan.cc b/service_scan.cc
index a4e284718..ad58b8c90 100644
--- a/service_scan.cc
+++ b/service_scan.cc
@@ -2137,6 +2137,10 @@ static void startNextProbe(nsock_pool nsp, nsock_iod nsi, ServiceGroup *SG,
         fatal("Failed to allocate Nsock I/O descriptor in %s()", __func__);
       }
       if (0 == svc->target->SourceSockAddr(&ss, &ss_len)) {
+        // Use the exact protocol-specific length.  Some platforms (e.g. FreeBSD)
+        // reject sizeof(sockaddr_storage) passed to bind() with EINVAL.
+        ss_len = (ss.ss_family == AF_INET6) ?
+          sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
         nsock_iod_set_localaddr(svc->niod, &ss, ss_len);
       }
       if (o.ipoptionslen)